How do i remove Blu Tack stains/marks from my wall without re-painting?

I've taken all my posters down and all remains of Blu Tack have been removed.


But there seems to be stains left behind or marks.


They look like little dark shadows...like this:


http://i28.tinypic.com/foeuys.jpg





How do i remove these cheaply without re-painting?


(Re-painting will cost me a lot of money and time. I am a student)How do i remove Blu Tack stains/marks from my wall without re-painting?
you will have to paint..... you dont have to paint the whole room.... maybe just something where it came down from.....